Sample Program – Python Dictionary

Posted by AnithaKamatchi on Saturday, April 14, 2018 in Python | No comments

pythonDictionary.py

# Dictionary - Python

from pip.utils.hashes import FAVORITE_HASH

from email.policy import default

studentInfo = {'rollNo':123,'name':'Avinash','age':8,'class':'III'}

print('*****Student Info*****')

print('Roll No: ',studentInfo['rollNo'],'\nName: ',studentInfo['name'],

      '\nAge; ',studentInfo['age'],'\nClass: ',studentInfo['class'])

fav = {'color':'Violet','fruit':'apple','animal':'tiger'}

print('\nFavourites: ',fav)

#dictionary functions

print('String representation: ',str(fav))

print('Length: ',len(fav))

print('Type: ',type(fav))

#copying a dictionary

fav_2 = dict.copy(fav)

print('fav_2 - copy of fav: ',fav_2)

#access the value by its key

print('Value of color: ',fav.get('color'))

#check if the key exits in the dictionary

print("Is the key fruit exists:", 'fruit' in fav)

#print the list of values in a dictionary

print('Values of fav: ',fav.values())

#print the list of key in a dictionary

print("Keys of fav: ",fav.keys())

#print the list of items in a dictionary

print("Items of fav: ",fav.items())

#create a dictionary from keys from another dictionary with default value none

fav_3 = dict.fromkeys(fav)

print("fav_3: ",fav_3)

#clear a dictionary

dict.clear(fav_3)

print('fav_3 after clear: ',fav_3)

#update a dictionary with another dictionary value pair

fav_3.update(fav_2)

print('fav_3 after updating with fav_2: ',fav_3)

#adds a key if not present

fav_3.setdefault('place')

print('fav_3 after setdefault key: ',fav_3)

output:

*****Student Info*****

Roll No:  123

Name:  Avinash

Age;  8

Class:  III

Favourites:  {'color': 'Violet', 'fruit': 'apple', 'animal': 'tiger'}

String representation:  {'color': 'Violet', 'fruit': 'apple', 'animal': 'tiger'}

Length:  3

Type:  <class 'dict'>

fav_2 - copy of fav:  {'color': 'Violet', 'fruit': 'apple', 'animal': 'tiger'}

Value of color:  Violet

Is the key fruit exists: True

Values of fav:  dict_values(['Violet', 'apple', 'tiger'])

Keys of fav:  dict_keys(['color', 'fruit', 'animal'])

Items of fav:  dict_items([('color', 'Violet'), ('fruit', 'apple'), ('animal', 'tiger')])

fav_3:  {'color': None, 'fruit': None, 'animal': None}

fav_3 after clear:  {}

fav_3 after updating with fav_2:  {'color': 'Violet', 'fruit': 'apple', 'animal': 'tiger'}

fav_3 after setdefault key:  {'color': 'Violet', 'fruit': 'apple', 'animal': 'tiger', 'place': None}